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/** * @fileoverview Rule to flag variable leak in CatchClauses in IE 8 and earlier * @author Ian Christian Myers * @deprecated in ESLint v5.1.0 */
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("./utils/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = { meta: { type: "suggestion",
docs: { description: "disallow `catch` clause parameters from shadowing variables in the outer scope", category: "Variables", recommended: false, url: "https://eslint.org/docs/rules/no-catch-shadow" },
replacedBy: ["no-shadow"],
deprecated: true, schema: [],
messages: { mutable: "Value of '{{name}}' may be overwritten in IE 8 and earlier." } },
create(context) {
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/** * Check if the parameters are been shadowed * @param {Object} scope current scope * @param {string} name parameter name * @returns {boolean} True is its been shadowed */ function paramIsShadowing(scope, name) { return astUtils.getVariableByName(scope, name) !== null; }
//--------------------------------------------------------------------------
// Public API
//--------------------------------------------------------------------------
return {
"CatchClause[param!=null]"(node) { let scope = context.getScope();
/* * When ecmaVersion >= 6, CatchClause creates its own scope * so start from one upper scope to exclude the current node */ if (scope.block === node) { scope = scope.upper; }
if (paramIsShadowing(scope, node.param.name)) { context.report({ node, messageId: "mutable", data: { name: node.param.name } }); } } };
} };
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